312157513 has 4 divisors (see below), whose sum is σ = 312288768. Its totient is φ = 312026260.

The previous prime is 312157499. The next prime is 312157529. The reversal of 312157513 is 315751213.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 315751213 = 31 ⋅10185523.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-312157513 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (312757513) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 61993 + ... + 66838.

It is an arithmetic number, because the mean of its divisors is an integer number (78072192).

Almost surely, 2^312157513 is an apocalyptic number.

It is an amenable number.

312157513 is a deficient number, since it is larger than the sum of its proper divisors (131255).

312157513 is a wasteful number, since it uses less digits than its factorization.

312157513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 131254.

The product of its digits is 3150, while the sum is 28.

The square root of 312157513 is about 17667.9798788656. The cubic root of 312157513 is about 678.3564061291.

The spelling of 312157513 in words is "three hundred twelve million, one hundred fifty-seven thousand, five hundred thirteen".